Lathe



" (No Model.)

B.- H. RADLEY.

DRILLING LATHE. No. 314,574; lPatented Mam. 31, 1885.

INVENTDRL' Ks// am... .V

VM A Ulllni `N1TEE STATES PATENT OFFICE BENJAMIN H. HADLEY, OF PROVIDENCE, RHODE ISLAND.

DRlLLlNG-LATHE.

SPECFIECATQN forming par?. of Letters Patent No. 314,574-, dated March 31, 1885.

Application filed May 2l, 1884. (No model.)

a handlever with the center spindle of the' tail-block and its operating-screw, whereby either the lever or the hand'screw may be used to move the spindle, as desired.

Figure l is a perspective view of a drillinglathe provided with my improvement. Fig. 2 is a top view of a tailblock, with aportion of the upper part of the same removed to show the segment-gear of the hand-lever. Fig. 3 is a transverse section of the tail-block-` Fig. LL is a section View of a portion of the tail-block showing` the rack.

In the accompanying drawings, A is the bed of the drilling-lathe, B the driving-head, and C the tail-block. The center spindle, D, of the tailhlocl; is inclosed by a cylindrical shell, E, at one side of which is out the rack F. The spindle D is also provided at its rear with a female screw, d, adapted to receive the operating-screw G, which is loosely held at the rear end of the shell E by means ofthe collar t and the hub b of the hand-wheel H. The tail-block C is provided with a slit, h, made longitudinally through the ears o c to the side of the bore for the spindle, and provided with the handscrews I I, which serve to clamp the inclosed shell E firmly whenever the spindle D is to be operated by means of the hand wheel and screw; but when the hand-screws I I are drawn back, thus loosening the shell E within the bore of the tail-block, the shell E and center spindle, D, may be caused to move together, and for this purpose I cut a rack, F, at one side ofthe shell E, adapted to engage with the segment-gear K, which is pivoted to an arm, J, projecting from the back of the taihblock by means of the stud L..

To the upper end ofthe hub of the segmentgear `K is pivoted the lever M, which, when brought forward for use, as shown in Fig. l, is also held in a notch, f, made in the iiange g, which .extends upwardly from the side of the segmentgear K. When the lever M is not in use, it may be turned back so as to hang froinits pivot, as shown in lllig. 3.

The hand-lever instead of being pivoted to the segment gear may be rigidly attached thereto, and may have the form of a hand- Wheel, if preferred.

I claim as my inventionl. In a tail-block for lathes, the combination of the spindle hand-screw,the spindle,the inclosing-shell having rack-teeth,the segmentgear, andthe pivoted hand-leverl adapt-ed to operate the spindle',substantially as described.

2. In a tail-block for lathes, the combination of the spindle hand-screw, the spindle, the inclosing-shell having rack-teeth, the segmentgear, and means for operating the same,

Witnesses:

SOCRATES SoHoLFIELD, J osEPH J. SOHOLEIELD. 

